I build software that
stays fast under load.

Associate Software Engineer at ShellBeeHaken Ltd, with a BSc in Software Engineering from SUST. I work across the stack — React and Next.js on the front, Node and Redis behind it — and I build AI systems on RAG pipelines, embeddings and vector search. Off hours go to competitive programming.

get in touch see the work

profile.jpeg

Dhaka, Bangladesh● open to work

stack.json

$ cat stack.json

languages

C/C++JavaJavaScriptTypeScript

ai/llm

RAG pipelinesEmbeddingsVector search

frameworks

React.jsNext.jsNest.jsNode.jsTailwind CSSREST APIsWebSockets

databases

MongoDBPostgreSQLMySQLRedisQdrantpgvector

tools

GitGitHubBitbucketJiraConfluence

stats --all

$ ./stats

600+problems solved
Codeforces · CodeChef · LeetCode

3.57/4CGPA
SUST, Software Engineering

5shipped projects
full stack & games

cf pupil 1213 · cc 3★ 1620

learning.log

$ tail -f learning.log

→Distributed locking
→Rate limiting & caching
→Redis clustering
→Multi-instance sync
→System design

watching

git log --author=rayhan

$ git log --oneline

Associate Software Engineer

Jun 2025 — present

ShellBeeHaken Ltd

·Built an AI voice agent for farmers on RAG pipelines, with context-aware retrieval and response generation in real time.
·Designed and implemented backend services for Kriyakarak, a live production system, spanning API development and frontend integration.
·Integrated embeddings and vector databases (Qdrant, pgvector) to sharpen semantic search accuracy and response relevance.
·Worked with caching, rate limiting and multi-instance synchronization to keep the system fast under load.
·Shipped through production deployments, debugging and iterative releases alongside cross-functional teams.

Next.jsNode.jsRAGQdrantRedisMongoDB

Intern Software Engineer

Dec 2024 — May 2025

ShellBeeHaken Ltd

·Worked on full-stack web development with React.js, Next.js and Node.js in production environments.
·Built internal tools and contributed to features running live.
·Developed a Twitter-like application with authentication, server-side rendering and real-time updates.
·Started out on browser games — Snake & Ladders in React and a dice game in JavaScript — to get the fundamentals down.
·Picked up Git workflows, REST API design and agile practices.

React.jsNext.jsNode.jsJavaScriptGit

education.md

$ cat education.md

BSc in Software Engineering

Shahjalal University of Science and Technology2020 — 2025 · CGPA 3.57 / 4.00 · Sylhet

Coursework across data structures, algorithms, databases, operating systems and software architecture — the base under everything I ship.

certs/

$ ls certs/

AWS AI Practitioner ChallengeUdacity · Apr 2026

resume.pdf

MD_Shafikul_Rahman.pdfupdated Jun 2026 · 1 page

wget resume

~/projects

$ ls -la ~/projects

Bloom Filter Username Check

2025

Fast username availability checks with controlled false positives. Multiple hash functions over a bit array, backed by Redis, cutting database lookups at scale.

Next.jsTypeScriptRedisMongoDB